I.B. 29C891B
Page 43
Effective 11/98
SECTION 5: TROUBLESHOOTING AND
MAINTENANCE
5-1 LEVEL OF REPAIR
This manual is written based on the assumption that
only unit-level troubleshooting will be performed. If the
cause of a malfunction is traced to a Digitrip OPTIM Trip
Unit, the device should be replaced. The malfunctioning
device may be returned to Cutler-Hammer for further
evaluation.
5-2 TROUBLESHOOTING
OPTIM Trip Units can be used with or without auxiliary
power. In addition, guidelines can vary to some degree
by circuit breaker type. To make the guidelines of Table
5.1
as user friendly as possible, the troubleshooting
table is divided by circuit breaker type, with and without
auxiliary power.
5-3 TRIP UNIT REPLACEMENT
If a trip unit or a circuit breaker must be replaced, con-
sult Cutler-Hammer for specific replacement instruc-
tions.
5-4 MAINTENANCE AND CARE
Except for the rating plug and the battery for the local
indicator, the Digitrip OPTIM Trip Unit is designed to be
a self contained and maintenance free device.
The Digitrip OPTIM Trip Unit should be stored in an
environment that does not exceed the temperature
range of -30° to +85°C. The environment should also be
free of excess humidity. Store the device in its original
packing material.
K, L and N-Frame Circuit Breakers with Auxiliary Power
Unit Status LED is not
Auxiliary power is not present or is
Measure voltage at +30VDC and NEG on side
Table A.1
blinking at approximately
reversed.
terminal block to be 30 ± 3 volts. Check polarity.
Wiring Diagrams
a one second on-off duty
cycle.
Open connection on breaker
Check orange and black wires on the side term-
Table A.1
internal wiring.
inal block.
Wiring Diagrams
Trip unit may be the problem.
Replace breaker. Refer to Note 1 at end of
Para. 5-3
Table 5.1
As soon as auxiliary power
Rating plug is not installed or pins
Install rating plug and/or check connections.
Para. 2-6 & 5-4.2
is applied, instantaneous
are not making good connection.
trip LED comes on and
breaker trips if initially
Rating plug is open internally
Replace rating plug
Para. 5-4.2, Table 2.1
closed.
Trip unit may be the problem.
Replace breaker. Refer to Note 1 at end of
Para. 5-3
Table 5.1
LED does not come on
Battery installed backwards
Install correctly
Para. 5-4.1
when battery check button
is pressed.
Dead battery
Replace battery
Para. 5-4.1, Table 2.2
Trip unit may be the problem.
Replace breaker. Refer to Note 1 at end of
Para. 5-3
Table 5.1
Table 5.1 Troubleshooting Guide (continued on next page)
Symptom
Probable Cause
Possible Solution(s)
References
Summary of Contents for Digitrip OPTIM 1050
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